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This retrospective case review investigates modifiable risk factors in sudden unexpected infant deaths, including those attributed to sudden infant death syndrome, and examines the impact of cosleeping with adults or siblings. The study examines sudden unexpected infant deaths from 1991 to 2000 in the state of Kentucky, excluding homicides and deaths from identifiable natural causes. Meta-analysis provides a cosleeping prevalence control in normal infants. Based on the findings described herein, we conclude that cosleeping may represent a risk factor in sudden unexpected infant deaths and that a full scene investigation, including whether the infant was cosleeping, should be sought in all cases of sudden infant death.